Granted Patent
Utility
US 4,318,280 · App. 06/131,656
Dual property shaft
Inventor:
James R. Williams
Patented Case
View Patent ↗
Granted: Mar 9, 1982
Filed: Mar 19, 1980
Inventor
James R. Williams
Assignee (at issue)
General Motors LLC
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.